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[RFC,2/7] cec-ioc-adap-g-caps.rst: document CEC_CAP_NEEDS_HPD

Message ID 20170525150626.29748-3-hverkuil@xs4all.nl (mailing list archive)
State New, archived
Headers show

Commit Message

Hans Verkuil May 25, 2017, 3:06 p.m. UTC 
From: Hans Verkuil <hans.verkuil@cisco.com>

Document the new CEC_CAP_NEEDS_HPD capability.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
---
 Documentation/media/uapi/cec/cec-ioc-adap-g-caps.rst | 8 ++++++++
 1 file changed, 8 insertions(+)
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Patch

diff --git a/Documentation/media/uapi/cec/cec-ioc-adap-g-caps.rst b/Documentation/media/uapi/cec/cec-ioc-adap-g-caps.rst
index a0e961f11017..6d7bf7bef3eb 100644
--- a/Documentation/media/uapi/cec/cec-ioc-adap-g-caps.rst
+++ b/Documentation/media/uapi/cec/cec-ioc-adap-g-caps.rst
@@ -113,6 +113,14 @@  returns the information to the application. The ioctl never fails.
       - 0x00000020
       - The CEC hardware can monitor all messages, not just directed and
 	broadcast messages.
+    * .. _`CEC-CAP-NEEDS-HPD`:
+
+      - ``CEC_CAP_NEEDS_HPD``
+      - 0x00000040
+      - The CEC hardware is only active if the HDMI Hotplug Detect pin is
+        high. This makes it impossible to use CEC to wake up displays that
+	set the HPD pin low when in standby mode, but keep the CEC bus
+	alive.